[jira] [Commented] (FLINK-5908) Blob Cache can (rarely) get corrupted on failed blob downloads

["Nico Kruber (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-5908?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16050456#comment-16050456 ] 

Nico Kruber commented on FLINK-5908:
------------------------------------

let's solve this during the re-write of the BLOB store with FLIP-19

> Blob Cache can (rarely) get corrupted on failed blob downloads
> --------------------------------------------------------------
>
>                 Key: FLINK-5908
>                 URL: https://issues.apache.org/jira/browse/FLINK-5908
>             Project: Flink
>          Issue Type: Bug
>          Components: Distributed Coordination, Network
>    Affects Versions: 1.2.0, 1.3.0, 1.4.0
>            Reporter: Stephan Ewen
>
> The Blob Cache downloads files directly to the target file location.
> While it tries to clean up failed attempts, there is a change that this cleanup does not complete.
> In that case, we have a corrupt file at the target location. The blob cache then assumes that it already has the file cached already and future requests do not attempt to re-download the file.
> The fix would be to download to a temp file name, validate the integrity, and rename to the target file path when the validation succeeds.
> The validation for "content addressable" could even include validating the checksum hash.



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